// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
#define MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_

#include <set>

#include "base/android/jni_android.h"
#include "base/macros.h"
#include "base/synchronization/lock.h"
#include "base/synchronization/waitable_event.h"
#include "media/audio/audio_manager_base.h"

namespace media {

class OpenSLESOutputStream;

// Android implemention of AudioManager.
class MEDIA_EXPORT AudioManagerAndroid : public AudioManagerBase {
public:
    AudioManagerAndroid(
        scoped_refptr<base::SingleThreadTaskRunner> task_runner,
        scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
        AudioLogFactory* audio_log_factory);

    void InitializeIfNeeded();

    // Implementation of AudioManager.
    bool HasAudioOutputDevices() override;
    bool HasAudioInputDevices() override;
    void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
    void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) override;
    AudioParameters GetInputStreamParameters(
        const std::string& device_id) override;

    AudioOutputStream* MakeAudioOutputStream(
        const AudioParameters& params,
        const std::string& device_id,
        const LogCallback& log_callback) override;
    AudioInputStream* MakeAudioInputStream(
        const AudioParameters& params,
        const std::string& device_id,
        const LogCallback& log_callback) override;
    void ReleaseOutputStream(AudioOutputStream* stream) override;
    void ReleaseInputStream(AudioInputStream* stream) override;
    const char* GetName() override;

    // Implementation of AudioManagerBase.
    AudioOutputStream* MakeLinearOutputStream(
        const AudioParameters& params,
        const LogCallback& log_callback) override;
    AudioOutputStream* MakeLowLatencyOutputStream(
        const AudioParameters& params,
        const std::string& device_id,
        const LogCallback& log_callback) override;
    AudioInputStream* MakeLinearInputStream(
        const AudioParameters& params,
        const std::string& device_id,
        const LogCallback& log_callback) override;
    AudioInputStream* MakeLowLatencyInputStream(
        const AudioParameters& params,
        const std::string& device_id,
        const LogCallback& log_callback) override;

    static bool RegisterAudioManager(JNIEnv* env);

    void SetMute(JNIEnv* env,
        const base::android::JavaParamRef<jobject>& obj,
        jboolean muted);

    // Sets a volume that applies to all this manager's output audio streams.
    // This overrides other SetVolume calls (e.g. through AudioHostMsg_SetVolume).
    void SetOutputVolumeOverride(double volume);
    bool HasOutputVolumeOverride(double* out_volume) const;

protected:
    ~AudioManagerAndroid() override;

    AudioParameters GetPreferredOutputStreamParameters(
        const std::string& output_device_id,
        const AudioParameters& input_params) override;

private:
    jobject GetJavaAudioManager();
    bool HasNoAudioInputStreams();
    void SetCommunicationAudioModeOn(bool on);
    bool SetAudioDevice(const std::string& device_id);
    int GetNativeOutputSampleRate();
    bool IsAudioLowLatencySupported();
    int GetAudioLowLatencyOutputFrameSize();
    int GetOptimalOutputFrameSize(int sample_rate, int channels);

    void DoSetMuteOnAudioThread(bool muted);
    void DoSetVolumeOnAudioThread(double volume);

    // Java AudioManager instance.
    base::android::ScopedJavaGlobalRef<jobject> j_audio_manager_;

    typedef std::set<OpenSLESOutputStream*> OutputStreams;
    OutputStreams streams_;

    // Enabled when first input stream is created and set to false when last
    // input stream is destroyed. Also affects the stream type of output streams.
    bool communication_mode_is_on_;

    // If set, overrides volume level on output streams
    bool output_volume_override_set_;
    double output_volume_override_;

    DISALLOW_COPY_AND_ASSIGN(AudioManagerAndroid);
};

} // namespace media

#endif // MEDIA_AUDIO_ANDROID_AUDIO_MANAGER_ANDROID_H_
